Dynamat or alternative for AC box

I'm having a condensation issue at my evaporator box.
It's enough to drip off after about 20 minutes of driving.

I haven't got much help on what might be causing it.
It doesn't freeze up and blows pretty cold.

The car was "professionally" converted to 134a before I got it.

I'm thinking about using self adhesive insulation on the outside of the box.
I see the Dynamat brand is somewhat expensive.
I'm less concerned about price as I am about potentially removing it if it doesn't resolve the issue.

Can anyone share experiences with removing it, or recommend an alternative that's cost effective and potentially removeable?

I'd also welcome any input on what might be my core issue.

FYI I'm around 50 on the low side and 225 on the high, which IIRC is about where it needs to be. I'd have to dig out my pics, but IIRC it was around 45-48 degrees at the vents.

It was suggested elsewhere to bleed off some refrigerant, which I did.
It reduced the cooling a few degrees but didn't stop the condensation.
I didn't go back an measure the pressures and I didn't bleed any more off because I didn't want to reduce the cooling any more.

Thanks.